Fuel tank options for 5.9 fi swap?

Has anybody figured out a factory replacement fuel tank option? It seems according to what I've read, fuel slosh is an issue with a stocker. I've seen guys have modified oe pumps to work evidently they may be too tall. So I was spitballin, and found the dimensions on the stock tank. 29"x19"x10". I didn't bother with the fractions of inches, not important yet. Would a grand Cherokee tank work? 33.6"x20.75"x13. Wouldn't have to modify a pump. Figure the only dimension that really seems to hurt would be the width...33.6". Here is where my ignorance comes into play. I've never had a running driving V8 Duster, just a slanty, with a tiny exhaust pipe. Do you think there is enough room in the width of a Duster to add 2" to both sides and still run a decent sized exhaust?